aLIGO LHO Logbook

H1 General

edmond.merilh@LIGO.ORG - posted 16:51, Friday 20 December 2019 - last comment - 18:28, Friday 20 December 2019(54018)

Tardy Shift Transitiond - Eve

TITLE: 12/21 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 116Mpc
OUTGOING OPERATOR: Camilla
CURRENT ENVIRONMENT:
    SEI_CONF state: USEISM
    Wind: 10mph Gusts, 9mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.74 μm/s
QUICK SUMMARY:

00:27 Intention bit dropped out of Observing

Squeezer became unlocked
- after 2 automated attempts it relocked itself
- going to utilize Automatic Operation of GRD_IFO node in case his happens again so H1 can "right itself"
  - I don't plan to leave it this way after my shift...maybe I could/should?

Comments related to this report

keita.kawabe@LIGO.ORG - 18:28, Friday 20 December 2019 (54021)

Link

Unlike earlier problems today/last night, this doesn't seem to be caused by SQZ ASC running away (1st attachment, see e.g. right panel).

In the second attachment which is the same as the 1st one except for time scale, there was a fast glitch in OPO servo at around t~-18sec, OPO servo started running away, and lost lock at about t=~+30 sec. Maybe PZT1 output of 5.5V right before the glitch was too small (the bottom rail is -10V) either in terms of control range or maybe in terms of PZT mirror tilt or something. Guardian seemed to have scanned it and put it at around +70V in the next lock.

Images attached to this comment